带有自定义 cacheResolver 的 spring 缓存 [英] spring cache with custom cacheResolver

问题描述

我想要动态缓存名称，和 spring 4.1 允许

I wand to have dynamic cache names, and spring 4.1 allows that

从 Spring 4.1 开始，缓存注解的 value 属性不再是强制性的，因为无论注解的内容如何，​​CacheResolver 都可以提供此特定信息.

Since Spring 4.1, the value attribute of the cache annotations are no longer mandatory since this particular information can be provided by the CacheResolver regardless of the content of the annotation.

请注意我如何在所有可能的级别上偏执地设置 cacheResolver:

Notice how I paranoidly set cacheResolver on all possible levels:

@Cacheable(cacheResolver = "defaultCacheResolver")
@CacheConfig(cacheResolver = "defaultCacheResolver")
public interface GatewayRepository extends CrudRepository<Gateway, Integer> {
    @Cacheable(cacheResolver = "defaultCacheResolver")
    Gateway findByBulkId(int bulkId);
}

Spring 4.1.5 仍然无法验证配置并出现错误:Caused by: java.lang.IllegalStateException: No cache names could be detected on 'public abstract skunkworks.data.Gateway skunkworks.repos.GatewayRepository.findByBulkId(int)'.确保在注释上设置 value 参数或在类级别声明 @CacheConfig 并使用要使用的默认缓存名称.在 org.springframework.cache.annotation.SpringCacheAnnotationParser.validateCacheOperation(SpringCacheAnnotationParser.java:240)

Spring 4.1.5 still fails to validate the config with error: Caused by: java.lang.IllegalStateException: No cache names could be detected on 'public abstract skunkworks.data.Gateway skunkworks.repos.GatewayRepository.findByBulkId(int)'. Make sure to set the value parameter on the annotation or declare a @CacheConfig at the class-level with the default cache name(s) to use. at org.springframework.cache.annotation.SpringCacheAnnotationParser.validateCacheOperation(SpringCacheAnnotationParser.java:240)

推荐答案

我认为您应该在代码中的某处指定缓存名称.

I think you should specify cache name somewhere in your code.

在基本用法中，缓存名称在@Cacheable、@CachePut 或@CacheEvict 注释中给出.

In the basic usage, cache name is given in @Cacheable, @CachePut or @CacheEvict annotations.

@Cacheable(cacheNames = "myCache")

@Cacheable(cacheNames = "myCache")

您也可以在类级注解@CacheConfig中指定.

You can also specify it in the @CacheConfig which is a class-level annotation.

@CacheConfig(cacheNames = "myCache")

@CacheConfig(cacheNames = "myCache")

如果需要更灵活的缓存机制，可以使用CacheResolver.在这种情况下，您应该创建自己的 CacheResolver.一些类似的东西:

If you need more flexible caching mechanism, you can use CacheResolver. In this case you should create your own CacheResolver. Something along these lines:

public class CustomCacheResolver implements CacheResolver {

    private final CacheManager cacheManager;

    public CustomCacheResolver(CacheManager cacheManager){
        this.cacheManager = cacheManager;
    }

    @Override
    public Collection<? extends Cache> resolveCaches(CacheOperationInvocationContext<?> context) {
        Collection<Cache> caches = new ArrayList<>();
        if(context.getTarget().getClass() == GatewayRepository.class){
            if(context.getMethod().getName().equals("findByBulkId")){
                caches.add(cacheManager.getCache("gatewayCache"));
            }
        }

        return caches;
    }
}

在这一步中，缓存名称是

In this step, cache name is

网关缓存

在cacheresolver中单独定义，注解端可以省略.

which is defined solely in the cacheresolver and it can be omitted in the annotation side.

在这一步之后，你应该注册CacheResolver:

After this step, you should register CacheResolver:

@Configuration
@EnableCaching
public class CacheConfiguration extends CachingConfigurerSupport {

    @Bean
    @Override
    public CacheManager cacheManager() {
         // Desired CacheManager
    }

    @Bean
    @Override
    public CacheResolver cacheResolver() {
        return new CustomCacheResolver(cacheManager());
    }
}

作为最后一步，您应该在@Cacheable、@CachePut、@CacheConfig 等注释之一中指定 CustomCacheResolver.

And as the last step, you should specify CustomCacheResolver in one of @Cacheable, @CachePut, @CacheConfig etc. annotations.

@Cacheable(cacheResolver="cacheResolver")

您可以在此处查看代码示例

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